Imprint Lithography Template Using Block Copolymer Self-Assembly
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Solution Overview
Problem
Current nano-fabrication techniques, such as imprint lithography, face limitations in achieving high-resolution patterns and efficient pattern transfer due to material miscibility and etch resistance issues, particularly when using block copolymers for template formation and pattern transfer.
Innovation Solution
The use of block copolymers with controlled phase morphologies and composition adjustments to form templates with high-resolution patterns, combined with advanced lift-off and etch processes, enables the formation of precise patterns on substrates, enhancing etch resistance and pattern transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If block copolymers are used for template formation and pattern transfer, then high-resolution patterns can be achieved, but material miscibility and etch resistance issues occur
Solution Approach 1:
The patent employs block copolymers as composite materials with specific microphase-separated structures. The block copolymer consists of two or more distinct polymer blocks that self-assemble into ordered domains, providing both the high-resolution patterning capability and the etch resistance needed for reliable pattern transfer. The composite nature of the block copolymer allows simultaneous achievement of fine feature definition and material stability during etching processes.
Solution Approach 2:
The patent utilizes controlled changes in physical and chemical parameters of the block copolymer system, including composition ratios, molecular weight, and processing conditions. By adjusting these parameters, the patent optimizes both the resolution of formed patterns and the etch resistance of the template, resolving the contradiction between achieving high resolution and maintaining material reliability during etching.
2Manufacturing precision
If block copolymers with controlled phase morphologies are used, then high-resolution patterns are formed, but material miscibility issues arise
Solution Approach 1:
The patent exploits the local quality differences within block copolymers through microphase separation. Different blocks of the copolymer exhibit distinct chemical properties and affinities, allowing local regions to have different characteristics. This local differentiation enables the formation of well-defined phase morphologies with high resolution while managing material miscibility by confining phase separation to specific nanoscale domains rather than causing macroscopic mixing issues.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the creation of high-resolution patterns with improved etch resistance and uniformity, overcoming previous limitations in nano-fabrication by leveraging the self-assembly properties of block copolymers and advanced etching techniques.
Implementation Method 1
The use of block copolymers with controlled phase morphologies and composition adjustments to form templates with high-resolution patterns, combined with advanced lift-off and etch processes
Implementation Method 2
The patterning process uses a template spaced apart from the substrate and a formable liquid applied between the template and the substrate. The formable liquid is solidified to form a rigid layer that has a pattern conforming to a shape of the surface of the template
Data Source
AI summary
Systems, methods, and processes for forming imprint lithography templates from a multi-layer substrate are described. The multi-layer substrate may include a block copolymer layer positioned on a substrate layer. The block copolymer layer may include two or more domains. At least one domain may have a different composition sensitivity than another domain such that the domains have different reactions to a specific process. Reaction of the domains to the specific process may provide a pattern in the block copolymer layer. The pattern may be transferred into the substrate layer to form the imprint lithography template.